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dremf (3)
  • >> dremf (3) ( Linux man: Библиотечные вызовы )
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    NAME

    drem, dremf, dreml, remainder, remainderf, remainderl - floating-point remainder function
     
    

    SYNOPSIS

    #include <math.h>
    
    /* The C99 versions */
    double remainder(double x, double y);
    float remainderf(float x, float y);
    long double remainderl(long double x, long double y);
    
    /* Obsolete synonyms */
    double drem(double x, double y);
    float dremf(float x, float y);
    long double dreml(long double x, long double y);
    
    
    Link with -lm.

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    remainder(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
    remainderf(), remainderl(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
    drem(), dremf(), dreml(): _SVID_SOURCE || _BSD_SOURCE  

    DESCRIPTION

    The remainder() function computes the remainder of dividing x by y. The return value is x-n*y, where n is the value x / y, rounded to the nearest integer. If the absolute value of x-n*y is 0.5, n is chosen to be even.

    These functions are unaffected by the current rounding mode (see fenv(3)).

    The drem() function does precisely the same thing.  

    RETURN VALUE

    On success, these functions return the floating-point remainder, x-n*y. If the return value is 0, it has the sign of x.

    If x or y is a NaN, a NaN is returned.

    If x is an infinity, and y is not a NaN, a domain error occurs, and a NaN is returned.

    If y is zero, and x is not a NaN, a domain error occurs, and a NaN is returned.  

    ERRORS

    See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

    The following errors can occur:

    Domain error: x is an infinity and y is not a NaN
    An invalid floating-point exception (FE_INVALID) is raised.
    These functions do not set errno for this case.
    Domain error: y is zeroerrno
    is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.
     

    CONFORMING TO

    The functions remainder(), remainderf(), and remainderl() are specified in C99 and POSIX.1-2001.

    The function drem() is from 4.3BSD. The float and long double variants dremf() and dreml() exist on some systems, such as Tru64 and glibc2. Avoid the use of these functions in favor of remainder() etc.  

    BUGS

    The call


        remainder(nan(""), 0);

    returns a NaN, as expected, but wrongly causes a domain error; it should yield a silent NaN.  

    EXAMPLE

    The call "remainder(29.0, 3.0)" returns -1.  

    SEE ALSO

    fmod(3), remquo(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    BUGS
    EXAMPLE
    SEE ALSO
    COLOPHON


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